Price of Pizza Topping based on the size on the pizza

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Hi,I have a problem and I hope that anyone can help me!
I have 3 sizes of Pizza and the toppings still have the same price.
What I want is that whem I add Cheese on the small pizza the price of the topping should be 1€ and when I add the same Topping on a Medium Pizza the price of the Topping should be 2€ 

How can I do this?

Thank you!